420422173 has 2 divisors, whose sum is σ = 420422174. Its totient is φ = 420422172.

The previous prime is 420422131. The next prime is 420422209. The reversal of 420422173 is 371224024.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 412821124 + 7601049 = 20318^2 + 2757^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-420422173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420422113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210211086 + 210211087.

It is an arithmetic number, because the mean of its divisors is an integer number (210211087).

Almost surely, 2^420422173 is an apocalyptic number.

It is an amenable number.

420422173 is a deficient number, since it is larger than the sum of its proper divisors (1).

420422173 is an equidigital number, since it uses as much as digits as its factorization.

420422173 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2688, while the sum is 25.

The square root of 420422173 is about 20504.1989114425. The cubic root of 420422173 is about 749.1380753087.

Adding to 420422173 its reverse (371224024), we get a palindrome (791646197).

The spelling of 420422173 in words is "four hundred twenty million, four hundred twenty-two thousand, one hundred seventy-three".